Millstone-feeder



(N8 Mdel.)

L. E. KANE.

MILLSTONE FEEDER. l No. 377,762. A vPatented Feb. 14, 1888.

ARESL l InvEnLnr'g.

' UNITED STATES PATENT OFFICE. i

LOUIS KANE, OF CINCINNATI, OHIO.

MILLSTONE-FEEDER.

SPECIFICATION forming part of Letters Patent No. 377,762, dated February 1.4, 1888.

Application enea Jumet, 1855.

To all whom it may concern.'

Be it known that I, LoUIs E. KANE, a citizen of the United States, and aresident of Oincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Millstone-Feeders, of which the following is a specification.

My improvement relates to means for grind-- ing minerals, such as founders facings, cements, plaster,andsimilarsubstances. Thesesubstances are prepared for the millstones by first subjecting them-to the action of a stampingmill or chaser," which breaks them into irregular sizes. When the material so prepared is fed to the eye of the upper stone in the usual manner, the larger pieces do not at once pass between the stones, but play around the eye until broken small enough to enter, and when they first enter are vliable to throw the stones farther apart and cause an irregular feed. The materials fed to the mill often contain foreign materials, such as wood or pieces of iron. are liable to injure them, and always change the feed by throwing the stones apart. The dust arising from the eye of the stone is also very annoying, and causes considerable loss, especially in grinding coal, plumbago, Src., for founders facings, and the fine dust settling around the building is very combustible.

The object of my invention is to overcome these difficulties, and to providea constant, regular feed, that requires but little attention, prevents the dust escaping, and arrests all foreigny substances fed in with the material. It also provides a convenient means for regulating the feed accordingly as different materials are to be ground, and provides a ready means of access tothe preliminary grinders or breakers for the purpose of removing any foreign substances that may gather about the feed-throat without stopping the stone. These objects are attained by the means illustrated in the accompanying drawings, in which- Figure l. is a top View of my improved devices, and Fig. 2 is a central vertical section taken through linexxof Fig. 1. In this View the device is shown secured in place upon the upper stone. `The grinding-cone, spindle, and the regulating screw-shaft are shown in elevation.

These when they go between the stones Serial No. 169,895. (No model.) a

by similar reference-letters Wherever they occur'throughout the various views, A represents the case of vmy device, which is preferably a cylindrical shell of a size to -iit into the projecting from its periphery to rest upon the top of the stone, which angeis slotted from; the rim in, to pass over the screws. b, which are embedded in the upper stone. The case is tightened down upon the stone by nut-s on these screws.

The case'A has a lip or projection, a', from one side, and is covered by a cap, A', which by a thimble, a2, to receive the spout leading from the hopper. cap A is a depression extending entirely across it to receive a sliding gate, C. Cast upon the inside of the cylinder is a feather or spline, a3, which enters a groove in the ring D. This ring has also a feather on its inside,which enters a groove on the outside of the grinding-shell E, as is clearly shown on the lefthand side of Fig. 2, (the section being taken through the feather on the ring and the groove in the outside of the grinder,) to prevent the ring E from turning with the grinder.

The shell E and ring D are detachably connected together by screws passing through washersainto the ring D, a port-ion of the washers overlapping the ring E.' Across the 'top of the ring Disa yoke, F, which is swiveljointed to a vertical screw shaft, G. This screw-shaft is tapped through a boss, af, in the cap A', and is provided above the cap with two nuts,h. One of these nuts has a handle, h',

tain the`grind'ingshell E and its casing D in place. The upper one serves as a gage to determine the opening between the stationary dle, t', which is revolved by the lower stone.

The grinders E and I are made of steel or case-hardened iron. The purpose of making the grinder E in the form of a hollow cone, so as to lit within its casing, is that it may beremoved when worn and replaced without much expense. As here shown,when the grinders are worn it is only necessary to take out the screws eye ofthe upper stone, B. It has a flange, a,f

which serves as a set-screw or jam-nut tore- Y Referring to the parts, which are represented has au inclined circular opening surrounded Onthe under side of the grinder E .and the revolving cone-grinder I. Y The grinding-cone I is mounted upon a spin- IOO that hold the ring E in place through the overlapping washers, remove the grinder E, and replace it with another. The ring D, which is turned o" smooth to slide freely within the case, never needs renewing, and it is much cheaper to make the hollow cone E than it would be to make one piece as heavy asD and E. Besides, thelight shell can be more easily case-hardened if Yof cast-iron, or tempered if of steel.

In one side of the shell A is ahandhole closed by a vertically-sliding door, J, for the purpose of easy access to the grinding-cone to remove any foreign substance that may feed in with the material to be ground. This door is held in place upon the outside of the cylinder A by a rabbeted frame, which, with the shell of the case, forms a groove for the edge of the door. This frame is carried up upon each side of the door to near the top of the case. Between the stone B and the flange a of the cylinder is a packing, b', of rubber or other suitable material,to make a close joint to prevent the escape of dust.

The operation of the device is as follows: The tube from the hopper, which is not shown, closely fits within the thimble a of the cap, andfthe machine being started, the slide C is drawn back until its stop c strikes the edge of the cap A', when its opening regi isters with the opening of the cap. The

material fed to the grinders E I is broken by them to a uniform size and fed between the stones. To regulate the feed, the space between the grinding-coneand itscase or shell is increased or diminished by screwing or unscrewing the shaft G and elevatingV or lowering the stationary grinder. Should any piece be too large to be affected by grinders or foreign substances-such as pieces of iron, nails, or wood-'- getting into the case A in sucient quantities to interfere with the feed, which can be detected by the amount of material passing from the stones, the slide is shoved in, as shown in Fig. 1, the door .I slipped up, when the foreign substances may be removed'through the handhole without stopping the machine.

What I claim as new, and desire to secure by Letters Patent, is

The combination, substantially as specified, of the casing A A a, the ring D, fitted to slide vertically within the body ol' the casing, the non-rotating grinder E, detachably secured to Ysaid ring, the screw G, and yoke F, for raising and lowering the same, for the purpose of regulatingthe feed, the grinding-cone I, and spindle t', for the purpose specified.

LOUIS E. KANE.

Witnesses:

WM. GOERLICH, l T. H. GRIFFITH. 

